Final

Question 1

Where do you initialize the variable when dealing with loops?

Answer 1

Before the loop

Question 2

How do you check if two strings are equal?

Answer 2

A.equals(b)

Question 3

What do you do if you might not always want this.a = a; to be called?

Answer 3

You can put an if statement wether it happens or not depending on the condition you set.

Question 4

How do you call a method?

Answer 4

Just call it

Question 5

Animal c = new Cat();
Which methods are available to c?

Answer 5

Only animal methods not cat methods

Question 6

Animal c = new Cat();
How do you make cat methods available to c?

Answer 6

Cat d = (Cat) c;

Then call on d for the cat methods

Question 7

I’m abstract classes and methods is the a big or small?

Answer 7

Small

Question 8

How do you implement a child class?

Answer 8

Public class child extends parent{}

Question 9

How do you implement an interface?

Answer 9

Public class myclass implements interface1{}

Question 10

If a class has no parent, which class does it extend?

Answer 10

Object class

Question 11

How can you simply throw an exception?

Answer 11

If () { throw new exception(“error”); }

Question 12

How do you check if something is of object type?

Answer 12

If (x instanceof objectType){}

Question 13

What’s the difference between checked and unchecked exceptions.

Answer 13

Checked exceptions need to be caught or thrown (file is not found), unchecked (input mismatch) are runtime errors and don’t get found until runtime. Checked won’t let the program run if problem.

Question 14

How do enhanced for loops work?

Answer 14

They actually create new temporary items unlike just a numerical counter.
For (Passenger p : passengers){
P.setName(“sally”);
}

Question 15

How do you find the ASCII code for an item?

Answer 15

.charAt() and put an index value in the brackets if finding for an array or list

Question 16

Do you have to call super in order for a hold to call their parents default constructor?

Answer 16

No

Question 17

Where do super calls go?

Answer 17

Only on the first line of a method or constructor.

Question 18

How do you build an arrayList of objects?

Answer 18

ArrayList prey = new ArrayList();

Question 19

When building a child class, if the constructor uses some similar parameters how do you access them instead of repeating code?

Answer 19

Super(a ,b)

Question 20

How do you implement try catch

Answer 20

Try{block of code}

Catch(exception e){block of code}